Merriam-Webster's Collegiate Dictionary:lispnounEtymology:list processing
Date: 1959
a computer programming language that is designed for easy manipulation of data strings and is used extensively for work in artificial intelligence

lispI. verbEtymology: Middle English, from Old English -wlyspian; akin to Old High German lispen to lisp
Date: before 12th century
intransitive verb1. to pronounce the sibilants [s] and [z] imperfectly especially by turning them into [th] and [ṯẖ]
2. to speak falteringly, childishly, or with a lisp
transitive verb to utter falteringly or with a lisp
• lispernounII. nounDate: circa 1625
1. a speech defect or affectation characterized by lisping
2. a sound resembling a lisp

Free On-line Dictionary of Computing:lisp

LISt Processing language.

(Or mythically "Lots of Irritating Superfluous Parentheses").
Artificial Intelligence's mother tongue, a symbolic,
functional, recursive language based on the ideas of
lambda-calculus, variable-length lists and trees as
fundamental data types and the interpretation of code as data
and vice-versa.

Data objects in Lisp are lists and atoms. Lists may contain
lists and atoms. Atoms are either numbers or symbols.
Programs in Lisp are themselves lists of symbols which can be
treated as data. Most implementations of Lisp allow functions
with {side-effects} but there is a core of Lisp which is
purely functional.

All Lisp functions and programs are expressions that return
values; this, together with the high memory use of Lisp, gave
rise to Alan Perlis's famous quip (itself a take on an Oscar
Wilde quote) that "Lisp programmers know the value of
everything and the cost of nothing".

The original version was LISP 1, invented by John McCarthy at MIT in the late 1950s. Lisp is
actually older than any other high level language still in
use except Fortran. Accordingly, it has undergone
considerable change over the years. Modern variants are quite
different in detail. The dominant HLL among hackers until
the early 1980s, Lisp now shares the throne with C. See
languages of choice.

One significant application for Lisp has been as a proof by
example that most newer languages, such as COBOL and Ada,
are full of unnecessary crocks. When the Right Thing has
already been done once, there is no justification for
bogosity in newer languages.